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CVHE randomly throwing main for no apparent reason

Got a call today from a customer with a 500 ton CVHE. Engineering has had to reset the main twice in the past few weeks and said it happened again last night at midnight. Go out today and meg the motor 2200+, start the machine and check everything out, no problems. Briefly noticed a low oil pressure and quickly went away without producing a diagnostic. It only did this once but has me curious. Put a fluke current trend on today so will monitor that. Any thoughts would be appreciated.